Chain Measurement Arithmetic: Pin Intervals and Relative Elongation

Chain Measurement Arithmetic: Pin Intervals and Relative Elongation

Original quantitative learning practice in English. All 24 questions are included. Four supplied cases exercise six related calculation targets; they form one topic, not four separate tests. Every question includes the complete initial data. Use the stated model and retain intermediate precision. Choose one answer. Learning target: 20/24, not an official pass mark. This bank covers the calculation topic in its title; it is not a complete professional examination, design approval or operating instruction.
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A training measurement spans from the centre of the first pin to the centre of pin number 25. Nominal pitch is 15.875 mm; measured centre-to-centre span is 386 mm. The exercise assigns an allowable elongation of 1% of nominal span. This is a fictional comparison rule, not a manufacturer replacement criterion or a measurement procedure for a running chain. Calculate the nominal span in mm. Keep intermediate values unrounded; round the final result to four decimal places if necessary.